Depends on what's more important to you.
The look afterwards or the handling while you fill up the press with glass.
Just look at the horizontal one and try to imagine what a PITA it must be to fill up this press.
You' ve just a small amount of glass above the mandrel. I can foresee a lot of pressing until it's done. And constantly fear the top cools off to quick.
So my choice would be the vertical one.

Elke

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